public static function auth($mac, $m, $bytes, $key)
{
$p = Poly1305::instance();
$ctx = $p->init($key);
$p->update($ctx, $m, $bytes);
$p->finish($ctx, $mac);
}
public function crypto_onetimeauth($in, $length, $key)
{
$mac = new FieldElement(16);
Poly1305::auth($mac, $in, $length, $key);
return $mac;
}
